HC276 and 316SS materials were mixed together.
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Help: The 800 pressure gauges that have arrived come with condensation rings (the rings are assembled accordingly, one per pressure gauge). Calibration of the instrument panel was carried out after removing the condensation ring. After verification, the condensation rings were not reinstalled one by one in corresponding positions. Upon checking the drawings later, it was found that 4 of them were made of HC276 material, while the rest were made of 316 material. But by now all the condensation coils have been installed on site, and it’s no longer possible to tell which ones are made of special materials. Do any of you have any good suggestions? Measure the spectra one by one? Can it be distinguished by appearance? Seeking help from experts.
What more is there to check? If it breaks, just replace it
All materials of special types are treated as 316. The root valve on the pipeline side is made of carbon steel, and different welding electrodes and wires are used. Will there be problems over time?
You can’t divide it up anymore now; you can only fix or replace it when a problem arises
There are only four after all, right? Use those four to generate a spectrum; if it’s not correct, buy four more HC units and reinstall them. The ones that are removed can be used as spare parts for 316.
There’s no time to wait, and it’s not necessary either. First, determine the tag numbers and locations of those 4 C276 condensation elbows; conduct spectrographic analysis – what if the results are correct? Perform spectrographic analysis on the remaining condensation elbows that need to be replaced, to identify their material type, and label them accordingly. For example, paint the surface of C276 elbows red. These condensation elbows can be removed and replaced. Label the 4 316 condensation elbows that will be used in places where C276 is used, and purchase new ones for those areas where mixing of materials is required
What was said upstairs is excellent. There are mainly two directions: 1. First, find the four HC pipes. It should be easy to find: special materials aren’t used unless it’s a special case. First, identify these four pipes; then you can simply buy new HC units and install them. Prevent potential hazards from arising. 2 For other SS316 applications, HC is generally fine to use; higher and more corrosion-resistant materials can also be employed. It’s fine to check, but it’s not necessary.
The last edit to this post was made by qugd on 2021-12-18 at 21:06. The simplest way is: 1. Quickly order four more Hastelloy condensation bends for the four workstations that will be in use during operation, so as to ensure normal functioning； 2. Then find a handheld X-ray material detector; I believe Thermo Electric produces such devices, and China’s Tianrui Company also offers similar products ； Each of the other condensers is tested one by one; this is a non-destructive testing method. It only takes a few seconds to several dozen seconds to shine this instrument on the condenser, after which the approximate composition of its material can be determined. This makes it easy to identify the other four Hastelloy condensers, which can then be used as spare parts. Such material testing instruments can be found in waste recycling facilities (for scrap steel and metal materials), as well as in some alloy processing plants; they can simply be rented for use. For spectral detection, sampling is required, and the sample needs to be dissolved; otherwise, the condenser may get damaged. For the additional 800 spectral analysis samples, if testing is commissioned, the cost of testing will be considerable. Moreover, processing these 800 spectral samples also requires a significant amount of work.
I thought the same thing at that time. But HC276 was treated as if it were 316, and a different welding wire was used. There will be problems at the weld.